Abstract
Diurnal comparisons of sediment interstitial salinities with those of the immediately overlying water were conducted subtidally at five stations in the Fraser River estuary, B.C. These in situ studies indicated that the interstitial salinities of sediments containing a high proportion of silt were relatively constant despite large fluctuations in water column salinities; however, in sands, interstitial salinities closely followed diurnal salinity variations in the water column. Laboratory penetration studies were conducted using relatively undisturbed natural sediments. The results of the in situ and laboratory studies indicated that exchange between the interstitial and overlying water was influenced by three major factors: the rate of water flow above the sediment, the relative salinities of the interstitial and overlying water and the sediment composition.
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